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ECONOMIZING
AVAILABLE
NOT AVAILABLE
TEMPERATURE
Table 10 — Single Enthalpy and Dual Enthalpy High Limit Curves
ENTHALPY
TEMP. DRY
CURVE
BULB (°F)
ES1
80
ES2
75
ES3
70
ES4
65
ES5
60
HL
86
Enthalpy Control Sensor Configuration
The optional enthalpy control sensor (Part Number: HH57AC081)
communicates with the W7220 economizer controller on the
2-wire communications bus and can either be wired using a 2-pin
header or using a side connector. The HH57AC081 sensor can be
used as a single outside air enthalpy, a differential return enthalpy,
or a differential return temperature sensor depending on the
dipswitch setting.
Use Fig. 36 and Table 11 to locate the wiring terminals for each
enthalpy control sensor.
4-1/4 (108)
2-3/4 (70)
HH57AC081
Temp & Humidity
NOTE: Dimensions are in inches (mm)
Fig. 36 — HH57AC081 Sensor
(Used as OA Enthalpy, Return Air Dry Bulb, or Return
Air Enthalpy)
Fig. 35 — Single Enthalpy Curve Boundaries
TEMP.
ENTHALPY
DEWPOINT (°F)
(btu/lb/da)
60
28.0
57
26.0
54
24.0
51
22.0
48
20.0
66
32.4
51/64 (21)
2-1/64 (55)
POINT P1
HUMIDITY
TEMP. (°F)
(%RH)
80
36.8
75
39.6
70
42.3
65
44.8
60
46.9
86
38.9
Table 11 — HH57AC081 Sensor Wiring Terminations
TERMINAL
NUMBER
LABEL
1
S-BUS
2
S-BUS
Use Fig. 36 and Table 12 to set the DIP switches for the desired
use of the sensor.
Table 12 — HH57AC081 Sensor DIP Switch
DIP SWITCH POSITIONS FOR SWITCHES 1, 2, AND 3
USE
1
DA
OFF
RA
ON
OA
OFF
If using differential (return) enthalpy or temperature option, see
Table 9 for California Title 24 setting requirements by region.
21
DUAL ENTHALPY
HIGH LIMIT
SINGLE ENTHALPY
P2 (T,RH)
P1
(T,RH)
ES5
ES4
ES3
ES2
ES1
POINT P2
HUMIDITY
TEMP. (°F)
66.3
63.3
59.7
55.7
51.3
72.4
TYPE
DESCRIPTION
S-BUS
Communications
S-BUS
(Enthalpy Control
Sensor Bus)
S-BUS
Communications
S-BUS
(Enthalpy Control
Sensor Bus)
2
ON
OFF
OFF
OFF
OFF
OFF
HL
(%RH)
80.1
80.0
81.4
84.2
88.5
80.3
3
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